Development took about a year and a half, with the team aiming for as much realism as possible. Certain features, including multiplayer, were dropped. Over 15 million copies were sold, and ports for various games consoles were released, most in 1995. Theme Park received generally positive reviews. Reviewers praised the gameplay and humour, but criticised console ports for reasons such as lack of save or mouse support. The game received a Japanese localisation (in addition to normal Japanese releases), Shin Theme Park, released in 1997 for the Sega Saturn and Sony PlayStation, and remakes for the Nintendo DS and iOS, released in 2007 and 2011 respectively. Theme Hospital is Bullfrog's thematic successor to the game, and two direct sequels followed: Theme Park World (known as Sim Theme Park in some territories) and Theme Park Inc (also known as SimCoaster).

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Starting with a free plot of land in the United Kingdom and few hundred thousand pounds, the player must build a profitable amusement park.[1] Money is spent on building rides, shops, and staff,[2] and earned through sale of entry tickets, merchandise, and refreshments.[3] Shops available include those selling foodstuff (such as ice creams) or soft drinks, and games such as coconut shies and arcades.[4] Their attributes can be customised, which may affect customers' behaviour: for example, affecting the flavour of foods (e.g. by altering the amount of sugar an ice cream contains) may affect customers' enticements to return.[5] Facilities such as toilets, and items that enhance the park's scenery (such as trees and fountains) can be purchased.[6] Over thirty attractions, ranging in complexity from the bouncy castle, to aeroplane flying, and more complicated and expensive rides such as the roller coaster and Ferris wheel are available. Also available as rides are shows (called 'acts') with themes such as clowns and mediaeval.[7] Certain rides, such as roller coasters, require a track to be laid out.[8] The ride complement varies between platforms: for example, the PlayStation version is missing the mediaeval and dolphin shows.[9] Rides require regular maintenance: if neglected for too long they will explode.[10] Depending on the platform, it is possible to tour the park or the rides.[11][12]

Visitors arrive and leave via a bus. The entry price can be set, and loans can be taken out.[13] The player starts with a limited number of shops, rides, and facilities available. Research must be carried out to purchase others.[14] Research can also make rides more durable, staff more efficient, and buses larger with increased capacity. The topic of research and how much funding goes into it is determined by the player.[15]

Staff available for employment include entertainers, security guards, mechanics, and handymen.[16] Lack of staff can cause problems, including messy footpaths, rides breaking down, crime, and unhappy visitors.[17] If visitors become unhappy, thugs may come to vandalise the park by committing offences such as beating up entertainers.[18] Occasionally, wages and the price of goods must be negotiated; failure to reach an agreement results in staff strikes or loss of shipment.[19][20]

Theme Park offers three levels of simulation: the higher difficulties requiring more management of aspects such as logistics. For example, at full level, the player must manage research, negotiations, stocks, and shares. On sandbox, the game does not involve those aspects.[21] The player can switch mode at any time.[22] Game time is implemented like a calendar: at the end of each year, the player is judged on that year's performance against rivals. Game speed can be adjusted, and staff can be moved by the player.[23] Cash awards may be earned for doing well, and trophies may be awarded for achievements such as having the longest roller coaster.[24]

The goal is to increase the park's value and available money so that it can be sold and a new lot purchased from another part of the world to start a new theme park.[25] Once enough money has been made, the player can auction the park and move on to newer plots,[26] located worldwide and having different factors affecting gameplay, including the economy, weather, terrain and land value.[27][28] The Mega Drive and SNES versions feature different settings (e.g. desert and glacier) depending on the park's location.[29]

Peter Molyneux stated that he came up with the idea of creating Theme Park because he felt the business genre was worth pursuing.[30] In an interview, he explained that the primary reason he created Theme Park was because he wanted players to create their dream Theme Park. Another reason is he wanted players to understand the kind of work running one entails. The three difficulty settings enable players to choose the desired depth: simply having fun creating a theme park, or making all the business decisions too. Molyneux stated that the most difficult part to program was the visitors' behaviour.[31]

The story was originally to have the player play the role of a nephew who had inherited a fortune from his aunt, to be spent only on the world's largest and most profitable theme park.[32] The graphics were drawn and modelled using 3D Studio.[32] Molyneux stated that each person takes about 200 bytes of memory, enough for them to have their own personality.[32] The team travelled the world visiting theme parks and taking notes, and sound effects were sampled from real parks. Molyneux explained that they were going for as mush realism as possible. There was to be a feature where a microphone is placed on a visitor and so the player could hear what they were saying,[30] and multiplayer support was dropped two weeks prior to release because of a deadline.[33] Multiplayer mode would have let players send thugs to other parks.[34]

Theme Park took roughly a year and a half to develop.[34] Much of the code was used in Theme Hospital, and an animation editor was improved by Theme Hospital's designer and producer Mark Webley, who dubbed it The Complex Engine.[35]Artist Gary Carr did not think the game was a good idea, and disliked the art style. Molyneux wanted him to create a colourful style to appeal to a Japanese market, but Carr disagreed and left Bullfrog. Carr later retracted his beliefs and, in 2012, stated that he considered the game a classic.[36] In 1994, Molyneux was developing both Theme Park and Magic Carpet.[37] The game was mostly complete by January 1994 and scheduled for release in late March (this was pushed back to June,[32] and then August[38]).[39]Theme Park sold over 15 million copies,[35] and was extremely popular in Japan (the Japanese PlayStation version sold 85 thousand copies within weeks[40]),[41] as well as Europe.[37]Theme Park did not sell well in the United States; Molyneux hypothesised that this was because the graphics are too childish for American audiences.[37] The game is the first instalment in Bullfrog's Designer Series, and it was intended for the series to use Theme Park's engine and for each instalment to have three simulation levels.[42] The PC version was sponsored by Midland Bank.[43]

The four reviewers of Electronic Gaming Monthly commented that the game itself is great fun, but that the Jaguar conversion had confusing menus and dithered text which is excessively difficult to read.[54]GamePro echoed these criticisms and further stated that the Jaguar version suffers from frustrating slowdown. They summarised that "Ocean didn't work hard enough to make Theme Park look and sound good on the Jaguar".[72] A reviewer for Next Generation took the reverse position, saying that the Jaguar conversion "is seamless" and the game itself was mediocre. They elaborated that "Slow gameplay and confusing layouts keep it from ever achieving the addictiveness of the other 'god' games, and most players will find themselves bored before they've even run through all of the options".[58] German magazine Atari Inside complimented the addictiveness, but criticised the lack of save opportunities,[66] and ST Computer remarked the game's complexity and colourful graphics assured it of being long and attractive.[70]Mega Fun's main criticism of the Jaguar version was its inability to save in-game.[69]Edge commented that the game is complex, but praised the detail and addictiveness.[56]PC Gamer's Gary Whitta was highly impressed with the game: he eulogised the fun factor and compared it to that of SimCity 2000. He also praised the "gloriously cartoony" graphics and "exceptional" soundtrack. Theme Park was named as the PC Gamer June 1994 Game of The Month.[10][71]Computer and Video Games complimented the "cute" graphics, and described the game as "fun" and "feature-packed".[38]

Sam Hickman of Sega Saturn Magazine praised the Saturn version for retaining the original intro, music, speech samples, and features of the PC version (all of which had been left out of most previous console versions).[60] The Japanese magazine of the same name criticised the lack of mouse support.[63]Electronic Gaming Monthly commended the Saturn version for being a comprehensive port of the PC original, and applauded the addictive simulation gaming of Theme Park, calling it "SimCity with a playful spirit".[55]Mean Machines Sega compared it to the Mega Drive version, citing the save function and variety of entertainers as major improvements over that version.[48] A Next Generation critic lauded the game's "simple interface", "infectious gameplay", and "realistic business fundamentals". However, he felt the Saturn's "near-perfect" conversion of the PC original was commendable but unexciting, and expressed regret that there were no upgrades or additions.[59]

Reviewing the PlayStation version, Maximum said that the game "is probably one of the best sim games around. It manages to strike a balance between in-depth game play and personality, which you don't get with the more brow-furrowing games of this genre". However, they were disappointed that the only improvement in the PlayStation version is a view option.[57]

CU Amiga praised the addictiveness, and called the game "colourful".[61]Mean Machines Sega described the game as "the most complex Megadrive game ever created", and eulogised playability and longevity, but criticised the behaviour of the handymen.[62] Reviewing the PC and Macintosh versions, Jeuxvideo.com commended the visuals and British humour.[64][65] French magazine Joystick complimented the visitors' and ride animations.[67] Reviewing the SNES version, German magazine Mega Fun compared it to the Mega Drive version, and said it had better controls and music, creating atmosphere.[68]

In 1997, Theme Park appeared jointly with Theme Hospital at #61 on PC Gamer's list of top 100 games.[73]

Shin Theme Park. The visuals are redone to appeal to a Japanese audience.

A Japanese remake of Theme Park, titled Shin Theme Park(新テーマパーク,Shin Tēma Pāku?, lit. New Theme Park) was released on 11 April 1997 by Electronic Arts Victor for the Sony PlayStation and Sega Saturn.[74][75] This version is different to other releases in Japan; the game's style and visuals are changed.[75] The game was remade for the Nintendo DS by EA Japan. It was released in Japan on 15 March 2007 with releases in the US and Europe on 20 March 2007 and 23 March 2007. New features of the game are the user interface, which was designed to fit the stylus functionality of the DS platform, and bonus rides/shops exclusive to certain properties, such as a Tea Room themed on an AEC Routemaster bus for England, Japanese dojo-style bouncy castle for Japan, a Coliseum-themed Pizza Parlour for Italy, a La Sagrada Familia-themed Paella restaurant for Spain etc.[76] The remake is based on the DOS version.[25] The game differs from the original in that the game provides four different advisers.[76]Theme Park was remade for iOS in 2011. Items can only be placed on designated places, and the game relies on premium items. Rides can cost up to $60 (£46) in real money, and for this reason the game was not well received.[77][78][79]